TM 55-1520-240-23-6
7-283.5
TEST CARGO DOOR PRESSURE ACTUATED VALVE
(Continued)
7-283.5
PROOF PRESSURE TEST
1.
Connect test stand pressure hose (1) to port C of
valve (2).
2.
Connect test stand pressure hose (3) to port B of
valve (2).
3.
Install pressure caps on ports A and D.
4.
Simultaneously apply 4500 psig pressure at port
C and 300 psig pressure at port B. Hold for 2
minutes.
5.
Release pressure at ports C and B and repeat
step 4. There shall be no evidence of external
leakage or permanent set.
FREE FLOW CHECK (PORT C TO D)
6.
Remove pressure cap from port D of valve (2)
and pressure hose from port B.
7.
Install pressure cap on port B.
8.
Install test stand return hose (4) in port D.
9.
Apply 100 psig pressure at port C through hose
(1).
10.
Adjust needle valve (5) until flowmeter (6)
indicates 1.2 gpm at port D. Port D pressure
shall be 50 psig minimum.
FREE FLOW CHECK (PORT B TO A)
11.
Disconnect pressure hose (1) from port C of
valve (2).
12.
Disconnect return hose from port D.
13.
Install pressure caps on port C and D.
14.
Connect test stand pressure hose (3) at port B.
15.
Connect test stand return hose (7) at port A.
16.
Apply 50 psig pressure at port B.
17.
Adjust needle valve (8) until test stand flowmeter
indicates 1.2 gpm at port A. Port A pressure
shall be 37 psig minimum.
7-1060
